Auger.



No. 762,750- PATENTED JUNE 14,:1904. R. B. PALMER.

AUGBR.

nrmouron Mum 0013,1003.

no MODEL.

awe/Mom Patented. June 14, 1904.

PATENT ()FFICE.

RICHARD B. PALMER, EDWARDS, INDIANA.

AUGE'R.

SPECIFICATION forming part of Letters Patent No. 762,750, dated June 14, 1904.

Application filed October 3, 1903.

To all whom it may concern:

Be it known that I, RICHARD B. PALMER, a citizen of the United States, residing at Edwards, in the county of Vigo and State of- Indiana, have invented new and useful Improvements in Angers, of which the following is a specification.

This invention relates to earth-angers; and the primary object of the same is to provide means in a device of this class for overcoming suction when the auger is withdrawn from a hole and also to permit the loosened earth to have free upward movement therethrough without obstruction.

A further object of the invention is to provide an earth-auger which is effective in its operation and comparatively inexpensive in cost of manufacture.

With these and other objects and advantages in view the invention consists in the construction and arrangement of the several parts, as will be more fully hereinafter described and claimed.

In the drawings, Figure 1 is a sectional elevation of an auger embodying the features of the invention. Fig. 2 is a horizontal section taken on the line in m, Fig. 1, through the lower portion of the auger.

Similar numerals of reference are employed to indicate corresponding parts in the views.

The cylinder 1 of the improved auger has an unobstructed passage therethrough and a shank or lower terminal of a handle 2, at tached to the upper end thereof by means of oppositely-disposed arms 3. The cylinder 1 has a cutting or boring spiral 4, continued from the lower end thereof, the main features of the invention residing in such spiral. The boring or cutting spiral 4 comprises an elongated member 5, which has a downwardly and inwardly curved inclination. and is of a materially greater length than the diameter of the cylinder 1. This member 5 continues from a cutting member 6 at a greater elevation,the free extremity of the member or portion 5 of the cutting-spiral 4 projecting outwardly beyond the cylinder 1, as clearly shown by Fig. 2. The member 5, forming part of the cutting-spiral 4, continues into the part of the said spiral having the greatest width, the ter- Serial no. 175,658. (No model.)

minal of said member being practically the same width as the body of the spiral. The cutting member-also turns inwardly, and the terminal thereof opposite that merging into the member 5 projects over the free end of the latter, as clearly shown by Fig. 2. The member 6 from the point where it continues into the member 5 has its lower edge 7 directed at an upward angle of inclination, and thus the free extremity of said member 6 is reduced and occupies a position between the inner and outer edge portions of the member 5, over which it extends. The combined inner edges of the members 5 and 6 by the contour setforth form a substantially circular core-opening 8. Depending from the spiral cutter at a point opposite the terminals of the members 5 and 6 or where both members merge into each other a depending blade 9 is formed, which acts as a penetrating member and loosens the earth below the spiral when a rotation of the anger is set up and also serves to prevent displacement of the auger from the earth, particularly in the initial or starting step of boring.

When the auger is used to bore a hole in the earth, the blade is forced downwardly into the latter and the cylinder caused to be revolved through the handle or stem 2. The spiral cutter at the bottom of the cylinder will loosen the earth, and the diameter of the hole formed will be greater than that of the cylinder, owing to the length of the member 5 being in excess of the diameter of the cylinder. This will cause an air-space 10 to be formed in the hole, which will break up any tendency to suction when it is desired to drawthe auger from the earth. Both members of the spiral cutter having an inward direction will operate to scoop up the earth as it becomes loose, and a core of uncut earth will be formed in the center of the auger by reason of the presence of the opening 8. This core will of course be drawn out of the hole or separated when the auger is lifted, but will prevent the formation of a 9 IOO tions thereof may be varied at will. For all practical purposes it has been found that the member 5 should have a diametrical extent of about twelve inches and the cylinder and the member 6 a diametrical extent of about ten and one half inches. These measurements may be varied, however, proportionately to the change in dimensions of the entire auger structure.

Having thus fully described the invention, what is claimed as new is 1. An auger having a cylindrical body with a lower spiral cutter, the latter having one terminal projected outwardly beyond the body and overlapping the opposite terminal, the terminal of the spiral connecting with the body being reduced in width grad ually toward the body and the spiral as an entirety forming a substantially circular core-opening, and a penetrating blade depending from the spiral RICHARD B. PALMER.

Witnesses:

H. L. BERNI-IEIMER, W. N. Cox. 

